Re: [R] Extracting Hash via Vector

Thanks for your most reasonable reply, Henrique. - Gundala Viswanath Jakarta - Indonesia On Tue, Jan 13, 2009 at 8:01 PM, Henrique Dallazuanna wrote: > Try this: > > unlist(ifelse(q %in% names(x), x[q], NA)) > > On Tue, Jan 13, 2009 at 8:49 AM, Gundala Viswanath > wrote: >> >> Dear all, >> >>

Re: [R] Extracting Hash via Vector

Which R version do you have? I'm asking this because my 2.7.0 gives a different error message: > x[[q]] Error in x[[q]] : recursive indexing failed at level 2 Anyway, as Wacek said, x[[q]] is equivalent to x[["some"]][["more"]][["not_there"]] -- and you don't have an element called "more" in x[[

Re: [R] Extracting Hash via Vector

Wacek Kusnierczyk wrote: > > x[[q]] is equivalent to x[['some']][['more']][['not_there']]. since > x[['some']] is an atomic integer vector, it won't collaborate with > [['more']] > æsj, one more lousy statement. x[['some']] is an atomic *double* vector *with no element named 'more'*, hence x[

Re: [R] Extracting Hash via Vector

Wacek Kusnierczyk wrote: > > on the side, this fails as well (guess why), though some might expect it > should work fine: > > x[[c('some', 1)]] > # expected an integer, but subscript out of bounds reported > > expected a double, not an integer, of course, since the value comes from runif. vQ

Re: [R] Extracting Hash via Vector

Gundala Viswanath wrote: > Dear all, > > Suppose I have a hash created with this > > x <- list() > for (i in c('test', 'some', 'more')){ >x[[i]] <- runif(1) > } > this is not really a hash, even though you can retrieve elements by name, and not only by integer index. also, try to navigate

Re: [R] Extracting Hash via Vector

Try this: unlist(ifelse(q %in% names(x), x[q], NA)) On Tue, Jan 13, 2009 at 8:49 AM, Gundala Viswanath wrote: > Dear all, > > Suppose I have a hash created with this > > x <- list() > for (i in c('test', 'some', 'more')){ > x[[i]] <- runif(1) > } > > then I want to extract the elem of that ha

[R] Extracting Hash via Vector

Dear all, Suppose I have a hash created with this x <- list() for (i in c('test', 'some', 'more')){ x[[i]] <- runif(1) } then I want to extract the elem of that hash with a vector > q <- c("some", "more", "not_there") But why this failed? > extracted <- x[[q]] Error in x[[q]] : subscript